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We investigate the secure degrees of freedom (SDoF) of the K-user MIMOmultiple access (MAC) and the two user MIMO interference channel. An unknownnumber of eavesdroppers are trying to decode the messages sent by thetransmitters. Each eavesdropper is equipped with a number of antennas less thanor equal to a known value NE. The legitimate transmitters and receivers areassumed to have global channel knowledge. We present the sum SDoF of the twouser MIMO interference channel. We derive an upperbound on the sum SDoF of theK-user MAC channel and present an achievable scheme that partially meets thederived upperbound.

On the Secure Degrees of Freedom of the K-user MAC and 2-user Interference Channels